<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
</head>
<body>
    难度系数:<br>
    <!-- ********* Begin ********* -->
    
    <p><input type="radio" name="degree">简单</p>
    <p><input type="radio" name="degree">中等</p>
    <p><input type="radio" name="degree" disabled="disabled">困难</p>   
    <!-- ********* End ********* -->
</body>
</html>